Help with freezes on Dell Vostro 1400

It has stopped working properly all of a sudden. It starts up ok, I enter my password ok and it goes onto my desktop ok. But when I click on anything, whether it be an icon or the Start menu, it just freezes.

It's working fine in Safe mode. I've tried System Restore and CCleaner.

I have a feeling it might be when I tried to plug in a camera into the USB when it was shutting down (I didn't know it was shutting down). It might not be that, but that's when it started.

The hard drive may have bad sectors. It is going to be hard to check it using Checkdisk, because you can't get to where the check is. Are there any drive utilities available in the bios or right before boot up?